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+++ b/testing/web-platform/tests/css/css-pseudo/highlight-painting-shadows-vertical.html
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+<!doctype html>
+<meta charset="utf-8">
+<title>CSS Pseudo-Elements Test: Shadows on highlights vertical text</title>
+<link rel="author" name="Stephen Chenney" href="mailto:schenney@igalia.com">
+<link rel="help" href="https://drafts.csswg.org/css-pseudo-4/#highlight-painting">
+<link rel="match" href="highlight-painting-shadows-vertical-ref.html">
+<meta name="assert" value="::selection and ::target-text both with shadows are painted in the correct order, including originating element shadows">
+<meta name="fuzzy" content="0-32;0-4">
+<link rel="stylesheet" type="text/css" href="/fonts/ahem.css">
+<script src="support/selections.js"></script>
+<style>
+    :root {
+        font-family: Ahem;
+        writing-mode: vertical-lr;
+        line-height: 1;
+        white-space: pre;
+    }
+    p {
+        color: black;
+        text-shadow: 0.1em 0.1em rgba(0,0,0,0.5);
+        position: absolute;
+        top: 10px;
+        left: 10px;
+    }
+    p::selection {
+        color: green;
+        text-shadow: -0.25em -0.25em rgba(0,128,0,0.5);
+    }
+    p::target-text {
+        color: blue;
+        text-shadow: 0.25em 0.25em rgba(0,0,128,0.5);
+    }
+</style>
+<p>partially selected target</p>
+<script>
+    window.location.hash = "#:~:text=target";
+    const target = document.querySelector("p");
+    selectRangeWith(range => {
+        range.selectNodeContents(target);
+        range.setStart(target.childNodes[0], 4);
+        range.setEnd(target.childNodes[0], 21);
+    });
+</script>